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- Feb 17, 2014
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Going through physics when I ran into this issue. I just want to make sure my thinking is correct.
The way they explained the answer was that the normal force is smaller in setup II as compared to setup III because the rope is lifting the block off the ground, therefore decreasing the contact pressure between the block and ground. Since setup II has a smaller normal force, and because friction is proportional to normal force, setup II has a smaller frictional force. Since tension counteracts the friction horizontally, the horizontal component of tension must be smaller for setup II.
I drew up some diagrams and wanted to see if they were correct.
Sent from my iPhone using SDN mobile
The way they explained the answer was that the normal force is smaller in setup II as compared to setup III because the rope is lifting the block off the ground, therefore decreasing the contact pressure between the block and ground. Since setup II has a smaller normal force, and because friction is proportional to normal force, setup II has a smaller frictional force. Since tension counteracts the friction horizontally, the horizontal component of tension must be smaller for setup II.
I drew up some diagrams and wanted to see if they were correct.
Sent from my iPhone using SDN mobile
